Wyler 1502-4 Incaflex Chronograph Valjoux 72 Movement 37mm

Typical Wyler front load design with split stem. Service history is unknown but the watch runs well.All functions work (see video). Looks like number 1502-4 (?). and 1291 stamped on case back. Case size is 37mm, 45mm lug to lug, 18mm lug.